Hello Gayanfernando94,
If you are a member of Apple Music, then before you changed regions you would have had to cancel that subscription. Canceling a subscriptions does mean that the data associated with that subscription is deleted also.
If these are purchases you made from iTunes, then you should be able to download them following these steps:
1. Open the iTunes Store app.
• On your iPhone or iPod touch: At the bottom of your screen, tap More , then tap Purchased.
• On your iPad: Tap Purchased.
2. Tap Music. If you use Family Sharing, tap a family member’s name to see music that they purchased.
3. Find the music that you want to redownload, then tap it.
4. Tap the download button next to a song or album.
Don't see the music that you purchased?
These steps and more information is available at: Redownload music - Apple Support
Have a good day.